While in third grade

A teacher asked her third grade class to name things that ended with “tor” that eat things.
The first little boy said, “Alligator.”
“Very good James, that’s a big word.”
The second boy said, “Predator.”
“Yes, that’s another big word Alan. Very well done.”
Little Johnny says, “Vibrator.”
After nearly falling off her chair, she says, “That is a big word Johnny, but it doesn’t eat anything.”
“Well my mother has one and she says it eats frickin’ batteries like there’s no tomorrow!”